@joser9616 - One point. Just because they are "studio amplifiers" does not mean they are fully balanced. The analog input stage of the amp may be balanced, but the amplifier itself is single-ended. You can tell because the amp can be bridged-mono to double the power output. You would not be able to do this on a balanced/differential amplifier.
In actuality, pretty much all studio equipment is not fully balanced. "XLR balanced" was developed as a way to transfer analog signals between equipment devices, sometimes a very long distance (50-100+ feet). In almost all cases I have seen, the XLR input on a studio equipment will always convert to single-ended analog internally for purposes of volume / equalizer / mixing / etc. Then, on the output, it will convert back to "balanced XLR".
In actuality, pretty much all studio equipment is not fully balanced. "XLR balanced" was developed as a way to transfer analog signals between equipment devices, sometimes a very long distance (50-100+ feet). In almost all cases I have seen, the XLR input on a studio equipment will always convert to single-ended analog internally for purposes of volume / equalizer / mixing / etc. Then, on the output, it will convert back to "balanced XLR".